During a 6-year study of Musca autumnalis DeGeer population ecology in central Iowa, various ear-tag treatments were applied to cattle. Zero, one, or two tags impregnated with 10% permethrin or 13.7% stirofos were applied to cows at a cow/calf operation of between 250 and 350 head. The ecological studies permitted a test of the hypothesis of ear tag effectiveness without the bias of fly counts being associated with a particular treatment. The proportions of parous flies were used as an index of fly population age structure and were homogeneous among years. Thus adult survival rates were not detectably different. No effects of ear tags on face fly populations were detected.
Document Type: Research Article
Publication date: December 1, 1984
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